Preliminary study on the electrocatalytic performance of an iron biochar catalyst prepared from iron-enriched plants

被引:33
作者
Cao, Xinqiang [1 ,2 ]
Huang, Yingping [2 ,3 ]
Tang, Changcun [1 ,2 ]
Wang, Jianzhu [1 ,2 ]
Jonson, David [1 ,2 ]
Fang, Yanfen [1 ,2 ]
机构
[1] China Three Gorges Univ, Coll Biol & Pharmaceut Sci, Yichang 443002, Peoples R China
[2] China Three Gorges Univ, China Engn Res Ctr Ecoenvironm Three Gorges Reser, Minist Educ, Yichang 443002, Peoples R China
[3] China Three Gorges Univ, Coll Hydraul & Environm Engn, Yichang 443002, Peoples R China
来源
JOURNAL OF ENVIRONMENTAL SCIENCES | 2020年 / 88卷
基金
中国国家自然科学基金;
关键词
Hyperaccumulator; Eichhornia crassipes; Fe-doped biochar; H2O2; electrocatalysis; PEANUT SHELL; SOIL; WATER; NANOSHEETS; REDUCTION; OXIDATION; EFFICIENT; PATHWAYS; RECOVERY; REMOVAL;
D O I
10.1016/j.jes.2019.08.004
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Eichhornia crassipes is a hyperaccumulator of metals and has been widely used to remove metal pollutants from water, but disposal of contaminated plants is problematic. Biochar prepared from plants is commonly used to remediate soils and sequester carbon. Here, the catalytic activity of biochar prepared from plants enriched with iron was investigated as a potentially beneficial use of metal-contaminated plants. In a 30-day hydroponic experiment, E. crassipes was exposed to different concentrations of Fe(III) (0, 4, 8, 16, 32 and 64 mg/L), and Fe-biochar (Fe-BC) was prepared by pyrolysis of the plant roots. The biochar was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), Brunauer-Emmett-Teller (BET) analysis, X-ray photoelectron spectroscopy (XPS) and atomic absorption spectrometry (AAS). The original root morphology was visible and iron was present as gamma-Fe2O3 and Fe3O4. The biochar enriched with Fe(III) at 8 mg/L (8-Fe-BC) had the smallest specific surface area (SSA, 13.54 m(2)/g) and the highest Fe content (27.9 mg/g). Fe-BC catalytic activity was tested in the electrocatalytic reduction of H2O2 using cyclic voltammetry (CV). The largest reduction current (1.82 mA/cm(2)) was displayed by 8-Fe-BC, indicating the highest potential catalytic activity. We report here, for the first time, on the catalytic activity of biochar made from iron-enriched plants and demonstrate the potential for reusing metal-contaminated plants to produce a biochar catalyst. (C) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
引用
收藏
页码:81 / 89
页数:9
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